Key Management Protocol Sample Clauses

Key Management Protocol. Our proposed Key Management Protocol (KMP) relies on the widely accepted ECDH handshake, but minimizes airtime consumption by exchanging the public ECDH coefficients in implicit format, i.e. by using ECQV implicit certificates. Our design challenge is therefore to comply with the “fixed” nature of the resulting handshake (ephemeral ECDH coefficients would mandate an explicit digital signature). This is addressed by the exchange and handling of fresh nonces per each session, via two supplementary authentication messages following the initial ECDH exchange, which guarantee peer authentication and (fresh) key derivation. In details, the proposed protocol, non restrictively illustrated in Fig. 1 for the case of a constrained device D which mutually authenticates and negotiates a session key with a coordinator device C, comprises two phases. Without loss of generality, we assume that all the constrained devices, including the network coordinator, trust the same Certification Authority (CA), and possess the following cryptographic material: own public key, own private key, own implicit certificate, and CA’s public key. In the first phase, each peer X (i.e., C or D) sends to the other party a message comprising i) a nonce ρX , and ii) an implicit ECQV certificate CX . The receiver is thus able to: session key PK (or multiple keys, to distinguish encryption key from integrity key as customarily done in mainstream security protocols) via an ordinary/standard Key Derivation Function (KDF) χ, as: PK = χ(KCD, ρD, ρC) - details in section IV. We conclude this section by noting that the proposed KMP intrinsically supports fast opportunistic re-keying. In fact, based on the fixed ECDH mechanism, the key negotiation algorithm always produces the same shared secret for a specific device pairs. Therefore, the heavy cryptographic operations required by both ECQV and ECDH algorithms can be avoided in a subsequent handshake: a device can retrieve from a local cache the previously computed pre-master key and simply compute a new session key using the new exchanged nonces.
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